Muffins: – 1 ½ cups all-purpose flour – ¾ cup white sugar – 2 teaspoons baking powder – ½ teaspoon salt – ⅓ cup vegetable oil – 1 large egg – ⅓ cup milk, or more as needed – 1 cup fresh blueberrie Crumb Topping: – ½ cup white sugar – ⅓ cup all-purpose flour – ¼ cup butter, cubed – 1 ½ teaspoons ground cinnamon
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